Universe's Early Days
Gregg explains how the universe was once a sea of hydrogen and helium, devoid of much else.In this clip
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Related Questions
Tell me about the universe
Why hydrogen in the episode Nick Lane: Origin of Life, Evolution, Aliens, Biology, and Consciousness | Lex Fridman Podcast #318 and the clip Energy Origins of Life?
Can something come from nothing as discussed in the episode 676 - That time Stephen Hawking... with Dr. Brian Keating and the clip Universe from Nothing?